As everyone else is saying, we can't since we still don't know how and why most of the brain functions. We're a few decades aways from being able to make a 'cyberbrain' so to speak. Well since i think you're talking about a cybernetic brain, not a normal tissue based one. Duplicating an organic brain would only be useful if you could retain the memories that were in the original brain, which I'm not sure is possible. If there is a way, it might not be as practical in application as having a cybernetic brain replacement.
So I think a cyberbrain would be the most feasible way to duplicate a brain.

I have a stand that Man can duplicate the human brain in the future; but I can’t specify when(no one will) cos as what you guys were saying, scientist and neurologist are still way too far. They’re just starting to explore the human brain to understand it. Cyberbrain is what we can call it in the future(agree to Basou), but Cyberbrain may look like a thing designed with wires, cables and ICs. A human brain is complex, a delicate human part with cells and tissues. I still cannot fathom how this concept can be possible; but one thing for sure, it will in the future. I don’t have proof cos even geniuses don’t have their proof too. If I live a century more, perhaps I’ll find the answer.

This topic is so interesting so I want you guys to give information. If animal cloning is made possible, brain most probably will be cloned too.

I think something to keep in mind is that, to plan for growth and age, a cyberbrain will probably need to error on the side of too big; it would be rather inconvenient to run out of room there.

Could you empty the trash in your brain? Would it make that little sound? You'd probably have to go somewhere to have it done, or people would forget on purpose (and use it as an excuse like being late).

But what about the government cracking open your skull and stealing your digital candy? All that anti-torture training won't stope those hackers, Mr. Secret Agent. Gotta have a firewall, baby!

what would be the point in duplicating a brain? since technically its you in the brain you already have switching it with anouther you would technically be dead but that brain would be diffrent wouldnt it?

um we can't understand what sypris is saying so anyway...Yes we can clone brains and that in itself is like duplicating a brain because genetically the brain from the offspring would be the same as the donor. Although if you think about it that isn't a very good duplication because the offspring will acquire memories of it's own, experience different things, be younger (brain would have to grow). So we can duplicate brains but not EXACTLY the same brain =D *this message was created from the combined efforts of the hamster council (yes we were bored and had nothing to discuss)* ^(o.o)^^(o.o)^

similar to what hamster said;
well, we've cloned humans, right? and when you clone a human you have to clone the whole body, including the brain. so technically, duplicates of human brains have already been made.
but if you meant duplicating a brain completely, including one's memories exactly as they were, that would be far more difficult and close to impossile. even if you manage to import one's memories to another, they still would not be the same person and therefore sense and do different things. even if you make them physically impossible to move more than 2 feet away from the other person, they would still end up thinking different things. they would go into arguments, one of them remembering a part of the argument, the other one remembering another. even if you overcome all those, in the end, you'd find out that it was a somewhat pointless thing to do. (but it would be really nice to replace those pseudo-intellectuals' brains with real intellectual brains so they may not infect intelligence any longer. especially those that somehow get into gifted programs and get credited for things that they do not deserve. fie, fie!)

for the "brain food", i knew someone who ate pig brains because his family thought it made him smarter -_-; he wasn't very healthy.

"Some archaeological evidence suggests that the mourning rituals of European Neanderthals also involved the consumption of the brain."
and now, they're extinct.
ah, how i wish neanderthals still exist. (faltering into sci-fi geek mode, i believe that there are some of us that are part-neanderthal, though just a tiny percentage.)